kathisma
noun
one of the 20 divisions of the Psalter in the Greek rite.
The grammatical form denoting more than one person, place, thing, or idea.
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Cathisma, ka-thiz′ma, n. in Greek use, a portion of the psalter, there being altogether twenty cathismata: a troparion or short hymn used as a response.
From Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) by Various